This discussion paper examines past energy efficiency and low carbon home improvement schemes in Great Britain, focusing on their successes and failures. It emphasizes the importance of learning from these experiences to inform future initiatives aimed at achieving net zero carbon emissions by 2050. The paper outlines key schemes such as the Energy Company Obligation, the Green Deal, and the Renewable Heat Incentive, detailing their objectives and the challenges faced during implementation. It highlights the necessity for clear consumer guidance, effective monitoring, and protection against fraudulent practices in the energy efficiency sector. The paper also calls for a comprehensive net zero homes protection framework to ensure high standards and consumer trust. By analyzing previous schemes, the paper aims to provide actionable lessons that can enhance the effectiveness of future programs designed to promote energy efficiency and renewable technologies in homes.